Measuring apparatus



Patented Jan. 14, 1947 UNITED STATES PATENT OFFICE assignor toAktiebolaget Latex,

Sweden Stockholm,

Application May 15, 1941, Serial No. 393,549 In Sweden May 3, 1940 Theinvention relates to an apparatus for dispensing a predeterminedmeasured quantity of a pressure fluid by the actuation of a piston valvewhich is located in a valve chamber.

The invention may with particularadvantage be used in households todispense a predetermined quantity of water without the necessity ofturning a cock, which is sometimes rendered difficult or even impossiblewhen the cock has been too much tightened to prevent leakage.

Moreover, the invention may be successfully applied to devices fordosing liquids on sale, such as fuel, kerosene, petrol and the like,milk and other fluids.

An essential feature of the invention consists therein that the pistonof the piston valve has a pressure surface shutting off the pressuremedium entering the apparatus through the inlet and a pressure surfaceopening a passage for this pressure medium, the closing surface beinglarger than the opening surface.

The invention is further characterized by the fact that in addition tothe inlet for the pressure medium the valve has a main outlet andoutlets from the chamber as well as from that portion of the pistoncasing which islocated on the other side of the piston relative to thechamber and that equal or an average pressure prevails in all theseoutlets.

The valve chamber is provided with a valve to connect the chamber withits outlet. This valve is adapted to be opened by a button which may becombined with a counter to register its actuation.

The invention is illustrated in the accompanying drawing which is avertical section elevation of a fluid dispensing .device embodying thesame.

In the drawing, the reference numeral I designates a casing whichaccommodates a main chamber 4 having a larger diameter and a fluid inletchamber l having a smaller diameter; a main piston 2 is reciprocable inmain chamber 4 and piston sleeve 3 connected with the main piston 2 isreciprocable in pressure fluid inlet chamber 55. A feed inlet 5 for thepressure fluid leads into the interior of piston sleeve 3. A mainorifice 6 for dispensing the pressure fluid is located in the Wall ofinlet chamber I5; this orifice is adapted to be closed and to be openedby piston sleeve 3 upon reciprocation of the main piston 2.

A pressure relief passage 1 is located in casing l above main chamber 4;an outlet passage 2| is connected with the pressure relief passage 1which is provided with a relief valve l3. A seat 23 for relief valve I3is mounted in cover 22 of 4 Claims. (Cl. 137-.139)

casing 2. Valve i3 is provided with a frustoconical head it which isconnected with a central bypass tube ac and displaceable therewith.

A drainage outlet 8 from main chamber 4 is located underneath the pistonto connect this chamber with outlet passage 2|.

Central by-pass tube it] formed. as an extension of the relief valve It,extends through piston 2; a lateral orifice l is provided in the upperend of by-pass tube l0 and this lateral orifice is surrounded by acircular orifice [2, which is adapted to connect the interior of pistonsleeve 3 with main chamber 4 and relief passage 1.

The upper and the lower face of piston 2 are designated with numeralsl1, 18. Packing rings 4!, t2 are provided to seal the piston 2 and thepiston sleeve 3 in the casing. A button or roller [.4 is provided tocontrol valve l3. Main fluid dispensing orifice 6, relief passage 1 fromthe upper part of chamber 4 and drainage outlet 8 leading from theportion of this chamber underneath piston 2 ar connected with each otherby conduit 21.

The above described apparatus is operated in the following manner.

When piston 2 is in the position shown in the drawing and consequentlythe apparatus is closed, the pressure fluid cannot flow from inlet 5through the apparatus.

If now button M is actuated in such a manner that the pressure acting onthe shutting-off face ll of piston 2 is released the pressure prevailingunderneath the piston 2 will act on the opening surface i8 and move thepiston upward until it uncovers outlet 6; a direct connection is createdwith inlet 5 for the pressure fluid and therefore the latter may passdirectly through the apparatus to the outlet.

Meanwhile pressure fluid which enters the chamber 4 through orifice ll,tube l0 and orifice i2 will act on the shutting-off surface ll of piston2 so that it may be moved back against the influence of the pressurefluid entering through inlet 5. This is rendered possible because thechamber located underneath piston 2 communicates with the atmosphere andthe shutting-off pressure surface I1 is larger than the opening pressuresurface l8.

Accordingly, piston 2 moves downwards and piston sleeve 3 will finallyshut off outlet 6 so that the apparatus will be closed again, Apredetermined quantity of pressure medium has meanwhile passed throughthe apparatus. This quantity may be controlled by adjustment of thebutton 14 so that a larger or smaller portion of orifice l2 will beuncovered.

Valve [3 may be connected with a counter which registers the number ofactuations and the number of delivered quantities.

Having now described my invention, What I claim as new and desire tosecure by Letters Patent is:

1. An apparatus for dispensing a predetermined accurately measuredquantity of a pres-' sure fluid comprising in a casing a main chamberhaving a larger diameter and a fluid inlet chamber having a smallerdiameter, amain piston reciprocable in said main chamber, a pistonsleeve connected with said main piston reciprocable in said inletchamber, a feed inlet for the pressure fluid into the interior of saidpiston sleeve, a main fluid dispensing orifice in said inlet chamberadapted to be closed and to be opened by said piston sleeve upon thereciprocation of said main piston, a pressure relief passage located inthe casing above said main chamher, an outlet passage connected withsaid relief passage, a relief valve in said relief passage, a seat forsaid relief valve in said casing, means for controlling the position ofsaid relief valve, a drainage outlet from said main chamber underneaththe said piston to connect the said chamber with said outlet passage, acentral bypass tube extending through said piston formed as an extensionof said relief valve, a lateral orifice in the said by-pass tube and acircular orifice surrounding the same adapted to connect the interior ofsaid sleeve with said main chamber and with said relief passage.

2. An apparatus for dispersing a predetermined accurately measuredquantity of a pressure fluid comprising in a casing a main cylindricalchamber having a larger diameter and a fluid inlet cylindrical chamberhaving a smaller diameter, a main piston, reciprocable in said maincylindrical chamber, a central piston sleeve depending from said mainpiston reciprocable in said inlet cylindrical chamber, a feed inlet forthe pressure fluid into the interior of said piston sleeve, a main fluiddispensing orifice in said inlet chamber adapted to be closed and to beopened by said piston sleeve upon the reciprocation of said main piston,a pressure relief passage located in the casing above said main chamber,an outlet passage connected with said relief passage, a relief valve insaid relief passage, a seat for said relief valve in said casing, meansfor actuating said relief valve, a drainage outlet from said mainchamber underneath the said piston to connect the said chamber with saidoutlet passage, a central by-pass tube extending through said pistonformed as an extension of said relief valve, a lateral orifice in saidvalve tube and a circular orifice surrounding the same adapted toconnect the interior of said sleeve with the said main chamber and withthe said relief passage.

3. An apparatus for dispensing a predetermined measured quantity of afluid from a pressure fluid supply line, comprising a piston insertedinto said line, a casing for said piston, a main chamber having a largerdiameter and a fluid inlet chamber having a smaller diameter in saidcasing, a differential piston having a larger and a smaller operatingsurface reciprocable in said main chamber, a tubular sleeve connectedwith said main piston reciprocable in said inlet chamber, an inlet forthe pressure fluid into said inlet chamber, said sleeve extendingtowards said inlet and having a smaller diameter than said piston, amain outlet for said fluid, said sleeve being reciprocable to regulatethe flow of the fluid from said inlet to said main outlet, a tubeconnecting said main chamber with said fluid inlet chamber, a drainageconduit connected with said main chamber, a release valve forcontrolling the drained ofi fluid, said piston being adapted uponpressure reduction by said release valve in said main chamber to bemoved into the opening position and upon closing of the release valvedue to the pressure acting on its larger operating surface to bedisplaced in the closing position, a seat for said piston sleeve in saidinlet chamber, a separate seat for the piston located in said mainchamber in such a manner as to permit said piston to rest in the closingposition on said seat, to avoid friction at the periphery of said pistonand to prevent leakage in the closed position of said piston.

4. An apparatus for dispensing a predetermined measured quantity of apressure fluid comprising in a casing a main chamber having a largerdiameter and a fluid inlet chamber having a smaller diameter, a mainoutlet for said pressure fluid from said casing, a differential mainpiston having a larger and a smaller pressure surface reciprocable insaid main chamber, a piston sleeve attached to the smaller pressure faceof said main piston in such a manner as to take up the difference ofsaid pressure surfaces, said piston sleeve reciprocable in said fluidinlet chamber to regulate the flow of said pressure fluid from saidinlet chamber to said mainoutlet, a tube to connect said main chamberand said fluid inlet chamber, a drainage conduit connected with saidmain chamber, a release valve for controlling the drained off fluid,said piston being adapted upon pressure reduction by said release valvein said main chamber to be moved into the opening position and uponclosing of the release valve due to the pressure acting on its largeroperating surface to be displaced in the closing position, a seat forsaid piston sleeve in said inlet chamber, a separate seat for the pistonlocated in said main chamber in such a manner as to permit said pistonto rest in the closing position on said seat to avoid friction at theperiphery of said piston and to prevent leakage in the closed positionof said piston.

LARS ERIK JULIUS BLOMBERG.

